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https://www.readbyqxmd.com/read/28582603/stimuli-responsive-shape-transforming-nanostructured-particles
#1
Junhyuk Lee, Kang Hee Ku, Mingoo Kim, Jae Man Shin, Junghun Han, Chan Ho Park, Gi-Ra Yi, Se Gyu Jang, Bumjoon J Kim
Development of particles that change shape in response to external stimuli has been a long-thought goal for producing bioinspired, smart materials. Herein, the temperature-driven transformation of the shape and morphology of polymer particles composed of polystyrene-b-poly(4-vinylpyridine) (PS-b-P4VP) block copolymers (BCPs) and temperature-responsive poly(N-isopropylacrylamide) (PNIPAM) surfactants is reported. PNIPAM acts as a temperature-responsive surfactant with two important roles. First, PNIPAM stabilizes oil-in-water droplets as a P4VP-selective surfactant, creating a nearly neutral interface between the PS and P4VP domains together with cetyltrimethylammonium bromide, a PS-selective surfactant, to form anisotropic PS-b-P4VP particles (i...
June 5, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28557444/complex-and-hierarchical-2d-assemblies-via-crystallization-driven-self-assembly-of-poly-l-lactide-homopolymers-with-charged-termini
#2
Xiaoming He, Yunxiang He, Ming-Siao Hsiao, Robert L Harniman, Samuel Pearce, Mitchell A Winnik, Ian Manners
Poly(L-lactide) (PLLA)-based nanoparticles have attracted much attention with respect to applications in drug delivery and nanomedicine as a result of their biocompatibility and biodegradability. Nevertheless, the ability to prepare PLLA assem-blies with well-defined shape and dimensions is limited and represents key challenge. Herein we report access to a series of monodisperse complex and hierarchical colloidally-stable 2D structures based on PLLA cores using the seeded growth, "liv-ing-crystallization-driven self-assembly" method...
May 30, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28541658/characterizing-patterned-block-copolymer-thin-films-with-soft-x-rays
#3
Daniel F Sunday, Jiaxing Ren, Christopher D Liman, Lance D Williamson, Roel Gronheid, Paul F Nealey, R Joseph Kline
The directed self-assembly (DSA) of block copolymers (BCPs) is a potential solution for patterning critical features for integrated circuits at future technology nodes. For this process to be implemented, there needs to be a better understanding of how the template guides the assembly and induces subsurface changes in the lamellar structure. Using a rotational transmission X-ray scattering measurement coupled with soft X-rays to improve contrast between polymer components, the impact of the ratio of the guiding stripe width (W) to the BCP pitch (L0) was investigated...
June 6, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28538206/spectroscopic-far-or-terahertz-mid-infrared-and-raman-investigation-thermal-analysis-and-biological-activity-of-piplartine
#4
Anubha Srivastava, T Karthick, B D Joshi, Rashmi Mishra, Poonam Tandon, A P Ayala, Javier Ellena
Research in the field of medicinal plants including Piper species like long pepper (Piper longum L.- Piperaceae) is increasing all over the world due to its use in traditional and Ayurvedic medicine. Piplartine (piperlongumine, 5,6-dihydro-1-[(2E)-1-oxo-3-(3,4,5-trimethoxyphenyl)-2-propenyl]-2(1H)-pyridinone), a biologically active alkaloid/amide was isolated from the phytochemical investigations of Piper species, as long pepper. This alkaloid has cytotoxic, anti-fungal, anti-diabetic, anti-platelet aggregation, anti-tumoral, anxiolytic, anti-depressant, anti-leishmanial, and genotoxic activities, but, its anticancer property is the most promising and has been widely explored...
May 5, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28525260/three-dimensional-visualization-and-characterization-of-polymeric-self-assemblies-by-transmission-electron-microtomography
#5
Hiroshi Jinnai, Takeshi Higuchi, Xiaodong Zhuge, Akihito Kumamoto, Kees Joost Batenburg, Yuichi Ikuhara
Self-assembling structures and their dynamical processes in polymeric systems have been investigated using three-dimensional transmission electron microscopy (3D-TEM). Block copolymers (BCPs) self-assemble into nanoscale periodic structures called microphase-separated structures, a deep understanding of which is important for creating nanomaterials with superior physical properties, such as high-performance membranes with well-defined pore size and high-density data storage media. Because microphase-separated structures have become increasingly complicated with advances in precision polymerization, characterizing these complex morphologies is becoming increasingly difficult...
May 19, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28521981/self-assembly-of-maltoheptaose-b-pmma-block-copolymer-systems-10nm-resolution-in-thin-film-and-bulk-states
#6
C M Noronha, I Otsuka, C Bouilhac, C Rochas, P L M Barreto, R Borsali
This paper describes the self-assembly of oligosaccharide-based hybrid block copolymers (BCPs) consisting of maltoheptaose (MH) and poly(methyl methacrylate) (PMMA) into 10nm scale lamellar and cylindrical phases depending on the volume fractions of MH (ϕMH) and the annealing process. Time resolved SAXS study of the BCP bulk samples during thermal annealing indicated that the BCPs phase separate into 10nm scale periodical structures. The solvent vapor annealing induced self-organizations of the BCP into different phases depending on ϕMH and the weight fraction of THF/H2O...
August 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28482948/survey-of-preventable-disaster-deaths-at-medical-institutions-in-areas-affected-by-the-great-east-japan-earthquake-retrospective-survey-of-medical-institutions-in-miyagi-prefecture
#7
Satoshi Yamanouchi, Hiroyuki Sasaki, Hisayoshi Kondo, Tomohiko Mase, Yasuhiro Otomo, Yuichi Koido, Shigeki Kushimoto
Introduction In 2015, the authors reported the results of a preliminary investigation of preventable disaster deaths (PDDs) at medical institutions in areas affected by the Great East Japan Earthquake (2011). This initial survey considered only disaster base hospitals (DBHs) and hospitals that had experienced at least 20 patient deaths in Miyagi Prefecture (Japan); therefore, hospitals that experienced fewer than 20 patient deaths were not investigated. This was an additional study to the previous survey to better reflect PDD at hospitals across the entire prefecture...
May 9, 2017: Prehospital and Disaster Medicine
https://www.readbyqxmd.com/read/28470057/interfacial-energy-controlled-top-coats-for-gyroid-cylinder-phase-transitions-of-polystyrene-block-polydimethylsiloxane-block-copolymer-thin-films
#8
In Hyu Ryu, Yong Joo Kim, Yeon Sik Jung, Jong Sung Lim, Caroline A Ross, Jeong Gon Son
Block copolymers (BCPs) with a high Flory-Huggins interaction parameter (χ) can form well-defined sub-10 nm periodic structures and can be used as a template for fabrication of various functional nanostructures. However, the large difference of surface energy between the blocks commonly found in high-χ BCPs makes it challenging to stabilize a useful gyroid morphology in thin film form. Here, we used an interfacial-energy-tailored top-coat on a blended film of a polystyrene-block-polydimethylsiloxane (PS-b-PDMS) BCP and a low-molecular-weight PDMS homopolymer with a hydrophilic end functional group...
May 10, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28453799/early-to-mid-term-results-after-total-cavopulmonary-connection-performed-in-the-second-decade-of-life
#9
Alexandre Metras, Virginie Fouilloux, Mohammed Al-Yamani, Xavier Roques, Loic Macé, Jean-Benoît Thambo, Dominique Metras, Bernard Kreitmann, François Roubertie
OBJECTIVES: Total cavopulmonary connection (TCPC) performed in the second decade of life has rarely been studied. Thus, we investigated (bicentric study) early and late morbidity and mortality following completion of TCPC in these patients. METHODS: From January 1999 to June 2014, 63 patients (14.5 ± 2.9 years) underwent TCPC (extracardiac conduit). Palliation before completion was an isolated bidirectional cavopulmonary shunt (BCPS) in 3 patients or BCPS associated with additional pulmonary blood flow (APBF) that was either antegrade (Group 1) in 38 (63%) or retrograde (Group 2) in 22 (37%)...
May 1, 2017: Interactive Cardiovascular and Thoracic Surgery
https://www.readbyqxmd.com/read/28426050/expanding-the-morphology-library-of-block-copolymer-self-assemblies-with-clews-of-tubules
#10
Xiao-Li Sun, Dong-Ming Liu, Pan Wang, Jia-Lin Tan, Kang-Kang Li, Li Deng, Wen-Ming Wan
The morphology library of block copolymer (BCP) self-assemblies is limited, especially as far as tubular structures are concerned. Here, the morphology of clews of tubules is discovered for the first time by self-assembly of P4VP-b-PS BCPs with both high asymmetry and very high molecular weight, which successfully expands the morphology library of BCP self-assemblies.
April 20, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28419441/detailed-immunophenotyping-of-b-cell-precursors-in-regenerating-bone-marrow-of-acute-lymphoblastic-leukaemia-patients-implications-for-minimal-residual-disease-detection
#11
Prisca M J Theunissen, Lukasz Sedek, Valerie De Haas, Tomasz Szczepanski, Alita Van Der Sluijs, Ester Mejstrikova, Michaela Nováková, Tomas Kalina, Quentin Lecrevisse, Alberto Orfao, Arjan C Lankester, Jacques J M van Dongen, Vincent H J Van Der Velden
Flow cytometric detection of minimal residual disease (MRD) in children with B-cell precursor acute lymphoblastic leukaemia (BCP-ALL) requires immunophenotypic discrimination between residual leukaemic cells and B-cell precursors (BCPs) which regenerate during therapy intervals. In this study, EuroFlow-based 8-colour flow cytometry and innovative analysis tools were used to first characterize the immunophenotypic maturation of normal BCPs in bone marrow (BM) from healthy children, resulting in a continuous multiparametric pathway including transition stages...
April 17, 2017: British Journal of Haematology
https://www.readbyqxmd.com/read/28383894/effective-morphology-control-of-block-copolymers-and-spreading-area-dependent-phase-diagram-at-the-air-water-interface
#12
Dong Hyup Kim, So Youn Kim
Over the past several decades, tremendous efforts have been made to understand the fundamental physics of block copolymer (BCP) self-assembly in bulk or thin films, and this has led to the development of BCP-based bottom-up nanofabrication. BCPs also form periodic nanostructures at the air/water interface, which has potential application to ultrathin-film nanopatterning with molecular-level precision. Nonetheless, controlling the nanostructure formation at the air/water interface is restricted by the inherent parameters of BCPs; BCP morphology is determined by the hydrophilic-to-hydrophobic block ratio...
April 20, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28371251/surface-engineering-of-spherical-metal-nanoparticles-with-polymers-toward-selective-asymmetric-synthesis-of-nanobowls-and-janus-type-dimers
#13
Ben Liu, Srinivas Thanneeru, Aaron Lopes, Lei Jin, Meghan McCabe, Jie He
New synthetic methods capable of controlling structural and compositional complexities of asymmetric nanoparticles (NPs) are very challenging but highly desired. A simple and general synthetic approach to designing sophisticated asymmetric NPs by anisotropically patterning the surface of isotropic metallic NPs with amphiphilic block copolymers (BCPs) is reported. The selective galvanic replacement and seed-mediated growth of a second metal can be achieved on the exposed surface of metal NPs, resulting in the formation of nanobowls and Janus-type metal-metal dimers, respectively...
April 3, 2017: Small
https://www.readbyqxmd.com/read/28362291/nature-of-e2x2-%C3%AF-4c-6e-of-the-x-e-e-x-type-at-naphthalene-1-8-positions-and-model-elucidated-by-x-ray-crystallographic-analysis-and-qc-calculations-with-the-qtaim-approach
#14
Yutaka Tsubomoto, Satoko Hayashi, Waro Nakanishi, Takahiro Sasamori, Norihiro Tokitoh
The nature of E2X2 σ(4c-6e) of the X-*-E-*-E-*-X type is elucidated for 1-(8-XC10H6)E-E(C10H6X-8')-1' [(1) E, X = S, Cl; (2) S, Br; (3) Se, Cl; (4) Se, Br] after structural determination of (1), (3) and (4), together with model A [MeX---E(H)-E(H)---XMe (E = S and Se; X = Cl and Br)]. The quantum theory of atoms-in-molecules dual functional analysis (QTAIM-DFA) is applied. The total electron energy densities Hb(rc) are plotted versus Hb(rc) - Vb(rc)/2 for the interactions at the bond critical points (BCPs; *), where Vb(rc) show the potential energy densities at the BCPs...
April 1, 2017: Acta Crystallographica Section B, Structural Science, Crystal Engineering and Materials
https://www.readbyqxmd.com/read/28352902/self-assembly-of-gradient-copolymers-synthesized-in-semi-batch-mode-by-nitroxide-mediated-polymerization
#15
Kevin Wylie, Ian Bennett, Milan Marić
The effect of diffuse compositional interfaces on copolymer self-assembly was studied via gradient copolymers (GCP). Poly(methyl methacrylate)-grad-(styrene) (PMMA-grad-PSt) copolymers were synthesized in semi-batch mode using nitroxide-mediated polymerization (NMP) with varied monomer injection protocols to produce varied diffuse interfaces (number average molecular weights (Mn) ranged from 62 000 g mol(-1) to 94 000 g mol(-1) with dispersities (Đ) between 1.35 and 1.59). The GCPs were spun into thin films on substrates made neutral by (St-ran-MMA-ran-hydroxyethyl methacrylate) terpolymers and annealed at elevated temperature to produce vertically oriented microphase-separated domains...
April 12, 2017: Soft Matter
https://www.readbyqxmd.com/read/28329375/long-term-outcome-of-patients-with-right-atrial-isomerism-after-common-atrioventricular-valve-plasty
#16
Kenta Imai, Masaya Murata, Yujiro Ide, Mikio Sugano, Hiroki Ito, Kazuyoshi Kanno, Motonori Ishido, Ryohei Fukuba, Kisaburo Sakamoto
OBJECTIVES: To review long-term outcomes of patients with right atrial (RA) isomerism who underwent common atrioventricular valve (CAVV) plasty. METHODS: We retrospectively analysed 59 patients with RA isomerism operated on between January 2004 and April 2016. We divided patients into those with CAVV plasty (CAVV plasty (+), 29 patients) and without CAVV plasty (CAVV plasty (-), 30), and we compared the outcome between the groups. We further divided patients into those with CAVV plasty before bidirectional cavopulmonary shunt (BCPS) operation (group before BCPS, 13 patients) or CAVV plasty with or after BCPS (group with or after BCPS, 16), and we compared the outcome between these groups...
May 1, 2017: European Journal of Cardio-thoracic Surgery
https://www.readbyqxmd.com/read/28304153/perpendicular-orientation-control-without-interfacial-treatment-of-raft-synthesized-high-%C3%AF-block-copolymer-thin-films-with-sub-10-nm-features-prepared-via-thermal-annealing
#17
Ryuichi Nakatani, Hiroki Takano, Alvin Chandra, Yasunari Yoshimura, Lei Wang, Yoshinori Suzuki, Yuki Tanaka, Rina Maeda, Naoko Kihara, Shinya Minegishi, Ken Miyagi, Yuusuke Kasahara, Hironobu Sato, Yuriko Seino, Tsukasa Azuma, Hideaki Yokoyama, Christopher K Ober, Teruaki Hayakawa
In this study, a series of perpendicular lamellae-forming poly(polyhedral oligomeric silsesquioxane methacrylate-block-2,2,2-trifluoroethyl methacrylate)s (PMAPOSS-b-PTFEMAs) was developed based on the bottom-up concept of creating a simple yet effective material by tailoring the chemical properties and molecular composition of the material. The use of silicon (Si)-containing hybrid high-χ block copolymers (BCPs) provides easy access to sub-10 nm feature sizes. However, as the surface free energies (SFEs) of Si-containing polymers are typically vastly lower than organic polymers, this tends to result in the selective segregation of the inorganic block onto the air interface and increased difficulty in controlling the BCP orientation in thin films...
March 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28295720/dual-phase-separation-in-a-semiconfined-system-monodispersed-heterogeneous-block-copolymer-membranes-for-cell-encoding-and-patterning
#18
Xiuyu Wang, Xueyan Feng, Guiping Ma, Di Zhang, Yahong Chai, Maofa Ge, Li Yao
Block copolymers (BCPs) have the capacity to self-assemble into a myriad of well-defined aggregate structures, offering great promise for the construction of drug delivery, photolithographic templates, and complex nanoscale assemblies. A uniqueness of these materials is their propensity to become kinetically frozen in non-equilibrium states, implying that the process of self-assembly can be utilized to remodel the resulting structures. Here, a new semiconfined system for processing the BCP self-assembly is constructed, in which an unusual dual-phase separation occurs, including nonsolvent-induced microphase separation and osmotically driven macrophase separation, ultimately yielding heterogeneous BCP membranes...
May 2017: Advanced Materials
https://www.readbyqxmd.com/read/28263052/gisaxs-analysis-of-the-in-depth-morphology-of-thick-ps-b-pmma-films
#19
Federico Ferrarese Lupi, Tommaso Jacopo Giammaria, Gabriele Seguini, Michele Laus, Pavo Dubček, Branko Pivac, Sigrid Bernstorff, Michele Perego
The morphological evolution of cylinder-forming poly(styrene)-b-poly(methyl methacrylate) block copolymer (BCP) thick films treated at high temperatures in the rapid thermal processing (RTP) machine was monitored by means of in-depth grazing-incidence small-angle X-ray scattering (GISAXS). The use of this nondisruptive technique allowed one to reveal the formation of buried layers composed of both parallel- and perpendicular-oriented cylinders as a function of the film thickness (24 ≤ h ≤ 840 nm) and annealing time (0 ≤ t ≤ 900 s)...
March 29, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28257204/linear-four-chalcogen-interactions-in-radical-cationic-and-dicationic-dimers-of-1-5-dichalcogena-canes-nature-of-the-interactions-elucidated-by-qtaim-dual-functional-analysis-with-qc-calculations
#20
Satoko Hayashi, Kengo Nagata, Shota Otsuki, Waro Nakanishi
The dynamic and static nature of extended hypervalent interactions of the (B)E···(A)E···(A)E···(B)E type are elucidated for four center-seven electron interactions (4c-7e) in the radical cationic dimers (1·(+)) and 4c-6e in the dicationic dimers (1(2+)) of 1,5-(dichalcogena)canes (2: (A)E(CH2CH2CH2)2(B)E: (A)E, (B)E = S, Se, Te, and O). The quantum theory of atoms-in-molecules dual functional analysis (QTAIM-DFA) is applied for the analysis. Total electron energy densities Hb(rc) are plotted versus Hb(rc) - Vb(rc)/2 [= (ℏ(2)/8m)∇(2)ρb(rc)] at bond critical points (BCPs) of the interactions, where Vb(rc) values show potential energy densities at BCPs...
March 15, 2017: Journal of Physical Chemistry. A
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